Spool



FIG. 1 is a front perspective view of a spool, showing our new design;

FIG. 2 is a rear perspective view of our spool of FIG. 1; and,

FIG. 3 is a right side view of our spool of FIG. 1, the left side view being a mirror image thereof.

The broken lines circles shown on FIG. 2 form no part of the claimed design, and are for illustrative purposes only. 

The ornamental design for a spool, as shown and described. 